jQuery
		.extend({

			createUploadIframe : function(id, uri) {
				// create frame
				var frameId = 'jUploadFrame' + id;
				
				var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"'; 
				if(window.ActiveXObject) { 

					var Sys = {};
					var ua = navigator.userAgent.toLowerCase();
					window.ActiveXObject ? Sys.ie = ua.match(/msie ([\d.]+)/)[1] :
					document.getBoxObjectFor ? Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1] :
					window.MessageEvent && !document.getBoxObjectFor ? Sys.chrome = ua.match(/chrome\/([\d.]+)/)[1] :
					window.opera ? Sys.opera = ua.match(/opera.([\d.]+)/)[1] :
					window.openDatabase ? Sys.safari = ua.match(/version\/([\d.]+)/)[1] : 0;
					
					if (Sys.ie == "6.0"
						|| Sys.ie == "7.0"
						|| Sys.ie == "8.0") {
						if(typeof uri== 'boolean'){ 
							iframeHtml += ' src="' + 'javascript:false' + '"';
					   } else if(typeof uri== 'string'){ 
						   iframeHtml += ' src="' + uri + '"';
					   } 
					}
					
					
				} 
				
				iframeHtml += ' />';
				   
				 
				
//				var Sys = {};
//				var ua = navigator.userAgent.toLowerCase();
//				window.ActiveXObject ? Sys.ie = ua.match(/msie ([\d.]+)/)[1] :
//				document.getBoxObjectFor ? Sys.firefox = ua.match(/firefox\/([\d.]+)/)[1] :
//				window.MessageEvent && !document.getBoxObjectFor ? Sys.chrome = ua.match(/chrome\/([\d.]+)/)[1] :
//				window.opera ? Sys.opera = ua.match(/opera.([\d.]+)/)[1] :
//				window.openDatabase ? Sys.safari = ua.match(/version\/([\d.]+)/)[1] : 0;
//				
//				//以下进行测试
//				//if(Sys.ie) document.write('IE: '+Sys.ie);
//				
//				var io ;	
//				if (window.ActiveXObject) {
//					if (Sys.ie == "9.0") {
//						io = document.createElement('iframe');
//						io.id = frameId;
//						io.name = frameId;
//					} else if (Sys.ie == "6.0"
//							|| Sys.ie == "7.0"
//							|| Sys.ie == "8.0") {
//						var io = document.createElement('<iframe id="'
//								+ frameId + '" name="' + frameId + '" />');
//						if (typeof uri == 'boolean') {
//							io.src = 'javascript:false';
//						} else if (typeof uri == 'string') {
//							io.src = uri;
//						}
//					}
//				}

				jQuery(iframeHtml).appendTo(document.body);

				return jQuery('#' + frameId).get(0);
			},
			createUploadForm : function(id, fileElementId, data) {
				// create form
				var formId = 'jUploadForm' + id;
				var fileId = 'jUploadFile' + id;
				var form = jQuery('<form  action="" method="POST" name="'
						+ formId + '" id="' + formId
						+ '" enctype="multipart/form-data"></form>');
				if (data) {
					for ( var i in data) {
						jQuery(
								'<input type="hidden" name="' + i + '" value="'
										+ data[i] + '" />').appendTo(form);
					}
				}
				if (fileElementId instanceof Array) {
					for (var i = 0; i < fileElementId.length; i++) {
						var oldElement = jQuery('#' + fileElementId[i]);
						var newElement = jQuery(oldElement).clone();
						jQuery(oldElement).attr('id', fileId);
						jQuery(oldElement).before(newElement);
						jQuery(oldElement).appendTo(form);
					}
				} else {
					var oldElement = jQuery('#' + fileElementId);
					var newElement = jQuery(oldElement).clone();
					jQuery(oldElement).attr('id', fileId);
					jQuery(oldElement).before(newElement);
					jQuery(oldElement).appendTo(form);
				}
				// set attributes
				jQuery(form).css('position', 'absolute');
				jQuery(form).css('top', '-1200px');
				jQuery(form).css('left', '-1200px');
				jQuery(form).appendTo('body');
				return form;
			},

			ajaxFileUpload : function(s) {
				// TODO introduce global settings, allowing the client to modify
				// them for all requests, not only timeout
				s = jQuery.extend({}, jQuery.ajaxSettings, s);
				var id = new Date().getTime()
				var form = jQuery.createUploadForm(id, s.fileElementId,
						(typeof (s.data) == 'undefined' ? false : s.data));
				var io = jQuery.createUploadIframe(id, s.secureuri);
				var frameId = 'jUploadFrame' + id;
				var formId = 'jUploadForm' + id;
				// Watch for a new set of requests
				if (s.global && !jQuery.active++) {
					jQuery.event.trigger("ajaxStart");
				}
				var requestDone = false;
				// Create the request object
				var xml = {}
				if (s.global)
					jQuery.event.trigger("ajaxSend", [ xml, s ]);
				// Wait for a response to come back
				var uploadCallback = function(isTimeout) {
					debugger
					var io = document.getElementById(frameId);
					try {
						if (io.contentWindow) {
							if (security.isIE()) {
								xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerText
										: null;
								xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
										: io.contentWindow.document;
							} else {
								xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.textContent
										: null;
								xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
										: io.contentWindow.document;
							}

						} else if (io.contentDocument) {
							if (security.isIE()) {
								xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerText
										: null;
								xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument
										: io.contentDocument.document;
							} else {
								xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.textContent
										: null;
								xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument
										: io.contentWindow.document;
							}
						}
					} catch (e) {
						jQuery.handleError(s, xml, null, e);
					}
					if (xml || isTimeout == "timeout") {
						requestDone = true;
						var status;
						try {
							status = isTimeout != "timeout" ? "success"
									: "error";
							// Make sure that the request was successful or
							// notmodified
							if (status != "error") {
								// process the data (runs the xml through
								// httpData regardless of callback)
								var data = jQuery.uploadHttpData(xml,
										s.dataType);
								// If a local callback was specified, fire it
								// and pass it the data
								if (s.success)
									s.success(data, status);

								// Fire the global callback
								if (s.global)
									jQuery.event.trigger("ajaxSuccess", [ xml,
											s ]);
							} else
								jQuery.handleError(s, xml, status);
						} catch (e) {
							status = "error";
							jQuery.handleError(s, xml, status, e);
						}

						// The request was completed
						if (s.global)
							jQuery.event.trigger("ajaxComplete", [ xml, s ]);

						// Handle the global AJAX counter
						if (s.global && !--jQuery.active)
							jQuery.event.trigger("ajaxStop");

						// Process result
						if (s.complete)
							s.complete(xml, status);

						jQuery(io).unbind()

						setTimeout(function() {
							try {
								jQuery(io).remove();
								jQuery(form).remove();

							} catch (e) {
								jQuery.handleError(s, xml, null, e);
							}

						}, 100)

						xml = null

					}
				}
				// Timeout checker
				if (s.timeout > 0) {
					setTimeout(function() {
						// Check to see if the request is still happening
						if (!requestDone)
							uploadCallback("timeout");
					}, s.timeout);
				}
				try {

					var form = jQuery('#' + formId);
					jQuery(form).attr('action', s.url);
					jQuery(form).attr('method', 'POST');
					jQuery(form).attr('target', frameId);
					if (form.encoding) {
						jQuery(form).attr('encoding', 'multipart/form-data');
					} else {
						jQuery(form).attr('enctype', 'multipart/form-data');
					}
					jQuery(form).submit();

				} catch (e) {
					jQuery.handleError(s, xml, null, e);
				}

				jQuery('#' + frameId).load(uploadCallback);
				return {
					abort : function() {
					}
				};

			},

			uploadHttpData : function(r, type) {
				debugger
				var data = !type;
				data = type == "xml" || data ? r.responseXML : r.responseText;
				// If the type is "script", eval it in global context
				if (type == "script")
					jQuery.globalEval(data);
				// Get the JavaScript object, if JSON is used.
				if (type == "json")
					eval("data = " + data);
				// eval("data = \" "+data+" \" ");
				// evaluate scripts within html
				if (type == "html")
					jQuery("<div>").html(data).evalScripts();

				return data;
			},

			// 修复jquery1.6+的版本没有handleError方法
			handleError : function(s, xhr, status, e) {
				// If a local callback was specified, fire it
				debugger
				if (s.error) {
					s.error.call(s.context || s, xhr, status, e);
				}

				// Fire the global callback
				if (s.global) {
					(s.context ? jQuery(s.context) : jQuery.event).trigger(
							"ajaxError", [ xhr, s, e ]);
				}
			}
		})
